Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Benefit Plans [Abstract]
Expected minimum contributions made to defined benefit pension plan in 2012	$ 0
Contributions to the CERP	18,000	10,000	10,000
Contributions to the defined benefit pension plan	0
Minimum required contribution for 2012	0
Accumulated benefit obligation	110,200,000	103,900,000
Future accumulated other comprehensive income loss net of tax	2,900,000
Long-term investment target mix for equity securities	35.00%
Long-term investment target mix for fixed income securities	65.00%
Expected long-term rate of return on pension plan assets	7.00%	7.25%	7.25%
Annualized 10-year return for pension plan	6.10%
Rate of return	3.80%	11.00%
Pension expense	994,000
Expected pension expense for the upcoming fiscal year	$ 1,900,000